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@article{DE_1990_26_8_a26, author = {B. Z. Royhel}, title = {On an inverse problem for an equation of hyperbolic type}, journal = {Differencialʹnye uravneni\^a}, pages = {1462--1464}, publisher = {mathdoc}, volume = {26}, number = {8}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1990_26_8_a26/} }
B. Z. Royhel. On an inverse problem for an equation of hyperbolic type. Differencialʹnye uravneniâ, Tome 26 (1990) no. 8, pp. 1462-1464. http://geodesic.mathdoc.fr/item/DE_1990_26_8_a26/